Cobalt Self-Diffusion: A Study of the Method of Decrease in Surface Activity

Ruder, R. C.; Birchenall, C. E.

doi:10.1007/bf03397290

Cited by 12 publications

(8 citation statements)

References 2 publications

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“…On average the fractional error indicated from the experimental reproducibility was in some cases found to be as large as + 20%. This figure is slightly greater than the generally accepted standard of accuracy in diffusion studies, which is between + 5% and + 15%, see for example Ruder & Birchenall (1951) and Huntington et al (1961). The discrepancy between the calculated error and that found experimentally indicated that other sources of error were involved of which the following are examples: a) The layers removed during grinding were removed in such a way that the newly exposed face was not parallel to the original diffusion interface.…”

Section: 34 Total Error In Dmentioning

confidence: 73%

“…The method is rendered inaccurate by the experimental difficulties of reducing the heating and cooling times for each anneal to a minimum, and by surface diffusion, which will contribute a decrease in the surface activity. The method demands a knowledge of the absorption behaviour of the radiation (-Ruder & Birchenall 1951), since not all the activity measured can be attributed to the surface atoms. The method therefore is more applicable to systems in which the absorption is large.…”

Section: The Surface Decrease Methodsmentioning

confidence: 99%

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Diffusion in the intermetallic compound NiAl

Hancock

McDonnel

1971

Phys. Stat. Sol. (a)

222

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Section: 34 Total Error In Dmentioning

confidence: 73%

Section: The Surface Decrease Methodsmentioning

confidence: 99%

Diffusion in the intermetallic compound NiAl

Hancock

McDonnel

1971

Phys. Stat. Sol. (a)

222

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“…The results of the assessed mobilities are listed in Table 1. In Campbell et al [5] assessed the atomic mobility for the self-diffusion of fcc-Co and compared it with the early experimental data [19,20] (in fact, the authors misread the Co impurity diffusivity in fcc-Ni [20] as the self-diffusivity in fcc-Co). Only two more recent experimental data [21,22] were considered in the present work.…”

Section: Assessment Of Atomic Mobilitymentioning

confidence: 99%

Computational Study of Atomic Mobility for fcc Phase of Co-Fe and Co-Ni Binaries

Cui

Jiang

Ohnuma

et al. 2007

J Phs Eqil and Diff

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Abundant experimental diffusion data in two Co-base binary systems, that is, Co-Ni and Co-Fe, have been assessed to develop the atomic mobility for the face-centered cubic (fcc) phase of the two binaries. The general agreement is obtained by comprehensive comparisons made between the calculated and experimental diffusion coefficients. The developed mobility database, in conjunction with the CALPHAD-type thermodynamic description, has been successfully used to simulate such typical experimental interdiffusion phenomena as the concentration profiles, the microstructural stability of the Kirkendall plane, and the lattice plane displacement.

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“…This result is also expected because the surface energy values of metals are much higher than the glass surface, as shown in Table 1 resulting in large equilibrium contact angles (θ |equilibrium ) of Ag 38 and Co 39 on glass surface are 123 and 101°, respectively. However, the change in total surface area of Ag deposit is much higher than the Co deposit after annealing at 573 K. This is because the surface self-diffusion coefficient of Ag is ∼10 4 times higher than Co at 573 K. 40,41 Mass transfer in Ag nanostructure occurs primarily from nanotriangular pyramid corners rather than edges, as shown in the Figure 2c,d by the yellow outline triangle, due to higher chemical potential of Ag atoms in the corner region compared to edge region. This effect also occurs in Co nanostructure annealing, but at much smaller rates due to the lower self-diffusivity.…”

Section: ■ Analysis and Discussionmentioning

confidence: 99%

Thermal and Plasmonic Stabilization of Silver Nanostructures Using a Bilayer Anchoring Technique

Sandireddy

Koirala

Taz

et al. 2018

ACS Appl. Mater. Interfaces

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In this work, we demonstrate how to suppress the shape instability of silver (Ag) nanotriangular pyramids following high-temperature annealing without a coating or encapsulation, thus producing a more stable optical plasmonic system. Nanosphere lithography (NSL) was used to fabricate large-area arrays of nanotriangular pyramids of Ag on glass substrates. By using a combination of morphology and spectroscopic studies it was found that exposure of this system to high temperatures of 473 K and beyond in air led to a rapid change in nanostructure shape, and thus, the surface area, with a substantial change to the original plasmonic character. On the other hand, NSL nanotriangular pyramids made from bilayers of Ag on Co or Co on Ag showed much smaller changes in shape and area following annealing up to 573 K in air. In the case of pure Ag, the NSL nanotriangular pyramid changed into a more spherical shape with an overall decrease of ∼24% in its surface area following annealing at 573 K. This lead to a large blue shift of over ∼287 nm or ∼39% in the location of the dipolar plasmonic resonance. On the other hand, the triangular shape of Ag was retained in both the metal bilayer cases, with much smaller area changes of ∼10 and ∼9%, for the Ag deposit when on Co and when under Co, respectively. Consequently, the plasmonic shifts were substantially smaller, of ∼65 nm or about 9%, in these bilayer systems. The mechanism for this stabilization was attributed to the higher surface energy of Co and much lower diffusivity of Co as well as Ag on Co that resulted in an anchoring of the Ag shape to its original state. The plasmonic quality factor for the bimetal NSL nanotriangular pyramids also showed substantially improved stability over pure Ag, further indicating that this anchoring approach is a viable pathway to produce pristine Ag surfaces for high-temperature plasmonic applications.

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Cobalt Self-Diffusion: A Study of the Method of Decrease in Surface Activity

Cited by 12 publications

References 2 publications

Diffusion in the intermetallic compound NiAl

Diffusion in the intermetallic compound NiAl

Computational Study of Atomic Mobility for fcc Phase of Co-Fe and Co-Ni Binaries

Thermal and Plasmonic Stabilization of Silver Nanostructures Using a Bilayer Anchoring Technique

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